truesdell



(No Model.) 2 Sheets-Sheet 2.

H. TRUESDELL. FURNACE GRAIE. No. 541,189. Patented June 18,1895.

a h I h I U lllll IYOnW as muoroummwnsumomu u c V U rTnn ST TESPATENT Orrrcn."

HENRY TRUESDELL, OF HAWARDEN, IOWA, ASSIGNOR TO THE HAWARDEN FURNACE GRATE COMPANY, OF SAME PLACE.

FURNACE-GRATE.

SPECIFICATION forming part of Letters Ztatent No. 541,189, dated June 18, 1895.

Application filed February 28, 1894. Serial No. 501,813. (No model.)

To aZZ whom it may concern:

Be it known that I, HENRY TRU EsDELL, a citizen of the United States, residing at Hawarden, in the county of Sioux and State of Iowa, have invented certain new and useful Improvements in Furnace-Grates, of which the following is a specification, reference being had therein to the accompanying drawlogs.

Figure 1 is a plan view of one form of grate, showing it in position in a furnace; Fig. 2, a vertical section thereof, the furnace-walls being omitted; Fig. 3, a bottom view of a portion of the grate; Fig. 4, a detail bottom view of one of the grate-bars, and Fig. 5 a transverse section thereof on the line w a: of Fig. 4.

The object of this invention is mainly to improve the construction of the furnace-grate covered by reissued Patent No. 11,291, granted to Robert Rose November 29, 1892, said grate consisting of a series'of zig-zag or serpentine bars and means for imparting to them a limited compound movement, as more fully hereinafter appears.

In the drawings, a designates a suitable frame supported with in the furnace in a suitable manner; a, a stationary grate bar extending down the middle of the frame, flush with the grate-surface, and connected rigidly at its ends to the front and rear end-bars of the frame, said connection consisting preferably of a suitable dove-tail tongue 0. formed on each end of the bar and fitted in a similarly-shaped recess in the inner side of the adjacent end-bar of the frame. The movable grate-bars b are arranged in two series, one on each side of the central rigid bar, said bars being provided with the depending arms I),

- rounded at their lower ends and provided with the depending tips or pins b" which are made of wrought metal and cast in the bar at the time of molding the same.

J ournaled below the grate-bars, in bearings formed in the side-bars of frame a and in depending lugs c on the central bar are the transverse rock-shafts 0, one pair being employed for each series of bars and each having the lateral slotted supporting-arms 0, upon which rest the lugs or arms I) and through whose slots pass the pins or tips I).

The bars are formed zigzag in horizontal tense and prolonged heating.

section and wedge-shape in cross-section, as in the former patent, but they are also gradually thickened from their ends to a point mid way their length and they are also deepened toward the same point; the advantage of this construction over the old one being that buckling or distortion at the middle of the bars is avoided. Itis found in practice that 1 thus tapering the bars toward their ends keeps .them straight during long usage, whereas the former bars were liable'to distortion from in- It was also discovered that the pins ortips that work th rough the slotted arms frequently broke off when subjected to considerable strain, thereby necessitating the removal of the broken bar. This is obviated by forming the tips separately of wrought metal and casting around their ends the metal of the bars, whereby they are rendered very strong and fully ableto I withstand heavy strains.

The central rigid bar braces the frame and at the same time enables the grate-surface to be made into two sections whenever it is desirable on account of its area. The central bar, being formed like the movable bars, does not interrupt the continuity of the grate-surface or the draftarea. The dovetail connection (or its equivalent) enables the bar to be inserted with ease, without the use of bolts or other fastening devices. Of course, more than one stationary bar may be employed should the grate-surface be too large to form into two sections.

Each'rock-shaft is provided with a depending arm 0 and the arms of each pair are con nected by a horizontal rod (1, the inner end of which is connected adjustably to the arm 0 by a screw d, one end of the screw being pivotally attached to the depending arm and the other rigidly but adj ustably connected to the rod by means of clamping-nuts d" d", said nuts clamping between them a suitable projection 01 on the rod. The arm 0 near the front of the grate preferably works through a slot in the rod d, but it may be Otherwise pivotally connected if desired. The forward ends of bars (1 are adjustably connected to the operating-levers e, by screw-bolts e, which are secured rigidly in their adjusted positions by nuts e" e", which clamp between them a projection e on the end of rod d.

In practice it was found practically impossible to construct the grate-bars so that the V alternate bars would exactly balance each other when placed on the rock-shafts, in consequence of which it was rarely the case that the ends of the bars would come flush with each other. It is to avoid this difficulty that the present shaking-mechanism was devised. When the bars are put in place and it is found that their upper surfaces are not level, particularly at their ends, this may be remedied by simply shortening or lengthening the connection (1 which action raises and lowers the ends of the alternate grate-bars and'thereby enables the bars to be brought flush with each other.

It will be seen that the frame of the grate jshafts providedwith alternating lateral arms .and also o'perating arms, as at 0 a-rod d pivotally connecting arms 0 one. of its ends iing connected to one ofsaidarms c by a screw fconnection, an operatinglever, an adjustable connection between the rod d and-the operat- 'ing-levezgand grateabars supported on the lateral arms, substantially as described.

is constructed and set so as to-leave narrow spaces between its sides and rear end and the furnace walls. In each of these spaces a grate bar f is supported by brackets f connected to the frame-bars, or by other suitable means, draft spaces being-left between the furnacewalls and the frame-bars. The objection to placing tbefrarne close to the furnace-walls was that clinkers would form on the walls and ibars adapted to move alternatelyin vertioah iplanes, a stationary coupling bar-havingjouh inal bearings andrigidlyattached at its-ends {to the frame and interposed betweenthe two; a sets of grate-bars, rock-shaftsmonntcd in the :journalbearings-of the couplingbar and =baving'means for alternately moving the gratebars vertically, and means a for operating-the? ,rock-shafts, vsubstantially as described.-

frame-bars and interfere seriously with the shaking movements of the bars, the clinkers having been too firmly fixed and not projecting from the walls far enough to be readily broken off. By the present arrangement the clinkerswill not'interfere with the operation of the shaking-bars, asany clinkers projecting inwardly far enough to be struck by the bars may be readily broken ofi by the same and deposited in the ash-pit.

Having thus fully describedmy invention, what I claim is 1. The combination of a frame, a rigid grate g bar connecting its end bars, a section of'movablegrate bars supported on each side of and j flush with said rigid grate bar, rock shafts 5 ing rod between the operating arms, said rod 'being capable of being shortened or lengthhaving hearings in the frame and the rigid grate bar and-connected to the movable grate bars, and means for rocking said rock shafts,

substantially as described. 2. A cast iron grate-bar provided with integral dependingsupporting lugs and wrought metal pins cast in and depending from said supporting lugs, substantially as described. r z

3. The combination of a frame, rock-shafts journaled therein and provided with lateral c 3 supporting arms and operating arms, grate bars supported on said lateral arms, a connectened, and means for operating the rock-shafts, substantially as described.

4. The combinationof agrate-framaiockf-t 5. The combinationof a frame, two sets of In testimony whereof I aflix my signature gin presenceof: two witnesses.

HENRY TRUESDELL.

Witnesses:

W. D. HUNT, J W. ANDERSON. 

